OptimalSamplingSingleShellCNLO
==============================

.. code-block:: none

  % update gradients from an initial gradient set, such that the updated gradients are evenly distributed. 
  %
  % USAGE:
  %   [grad, xopt, fopt, retcode] = OptimalSamplingSingleShellCNLO(gradInitial, param)
  %
  % INPUT
  %   gradInitial       :  N x 3 gradient matrix, where each row is a point in sphere. 
  %   param.cartesian   :  true: use cartesian coordinate (with unit equality constraint);
  %                        false: use spherical coordinate (no unit equality constraint)
  %
  % 
  % OUTPUT
  %   grad              :  updated N x 3 gradient matrix. 
  %
  %
  % Reference:
  %   1. "Single- and Multiple-Shell Uniform Sampling Schemes for Diffusion MRI Using Spherical Codes", 
  %       Jian Cheng, Dinggang Shen, Pew-Thian Yap, Peter J. Basser, IEEE Transactions on Medical Imaging, 2017.  
  %   2. "Novel single and multiple shell uniform sampling schemes for diffusion MRI using spherical codes", 
  %       Jian Cheng, Dinggang Shen, Pew-Thian Yap, Peter J. Basser, MICCAI 2015.  
  %
  % Copyright (c) 2014, Jian Cheng <jian.cheng.1983@gmail.com>
  %